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Balance Sheet Components - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Accrued clinical trial cost $ 2,278 $ 3,252
Accrued payroll and related benefits 420 262
Accrued consulting and legal 180 79
Accrued interest 94  
Accrued other 21 77
Accrued expenses $ 2,993 $ 3,670